1,259 questions

1,103 answers

29 comments

141 users

Welcome to Biologyquestions.org Please ask any biology related questions and receive answers from other members of the community.




Ask a New Question:

Describe each stage of the flow of information starting with DNA and ending with a trait.

stages dna leading to traits
asked Feb 28, 2013 by anonymous

Your answer

Note: Please post new questions on the ask a question page. Thank you.

Privacy: Your email address will only be used for sending these notifications.
Anti-spam verification:

To avoid this verification in future, please log in or register.

1 Answer

This is somewhat complicated because many "traits" are comprised of several different genes. The basic flow of information is

DNA ------>RNA----->protein

DNA contains the "instructions" for building proteins.

A copy or "transcript" of the DNA is transferred to an RNA molecule

The RNA molecule is read and translated by the ribosome into an amino acid sequence which will then be folded into a particular shape to make a protein.

Several proteins combine to form protein complexes which perform functions within the organism.  The shapes of the proteins are determined by the DNA sequence.  The shape of the protein changes its function and ability to interact with other proteins and cell components.  Protein shapes and interactions are the basis of genetic traits.

A simple example might be a strain of bacteria that is resistant to anti-biotic. A bacterial strain of this type might include a DNA sequence which changes the shape of a protein making the anti-biotic unable to interact with it in the same way.  In this way, the bacteria are expressing resistance to the anti-biotic.
answered Apr 9, 2013 by anonymous




...